graphics-04 tree

 graphics-04 tree

#include <GL/gl.h>

#include <GL/glu.h>

#include <GL/glut.h>

#include <stdlib.h>

#include<string>

#include<math.h>

void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT);

    /*glColor3f(0.298, 0.616, 0.3137);

    glLineWidth(4);

    glBegin(GL_LINES);

    glVertex3f(25,25,0);

    glVertex3f(25,75,0);

    glEnd();*/

    glColor3f(0.0, 0.75, 1.0);

    glBegin(GL_POLYGON);

    glVertex3f(100,100,0);

    glVertex3f(100,80,0);

    glVertex3f(0,80,0);

    glVertex3f(0,100,0);

    glEnd();

    glColor3f(0.7,0.8,0.1);

    glBegin(GL_POLYGON);

    glVertex3f(10,10,0);

    glVertex3f(15,10,0);

    glVertex3f(15,70,0);

    glVertex3f(10,70,0);

    glEnd();

    glBegin(GL_POLYGON);

    glVertex3f(10,10,0);

    glVertex3f(15,10,0);

    glVertex3f(13,9,0);

    glVertex3f(7,5,0);

    glEnd();

    glBegin(GL_POLYGON);

    glVertex3f(15,10,0);

    glVertex3f(13,9,0);

    glVertex3f(17,4,0);

    glEnd();

    glBegin(GL_POLYGON);

    glVertex3f(5,80,0);

    glVertex3f(13,70,0);

    glVertex3f(10,70,0);

    glEnd();

    glBegin(GL_POLYGON);

    glVertex3f(15,70,0);

    glVertex3f(20,77,0);

    glVertex3f(13,70,0);

    glEnd();

    glutSwapBuffers();

}

void init(void)

{

    glClearColor (0.23, 0.8, 0.0, 0.0);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(0.0, 100.0, 0.0, 100.0, -1.0, 1.0);

}

int main(int argc, char** argv)

{

   glutInit(&argc, argv);

   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);

   glutInitWindowSize (1000, 600);

   glutInitWindowPosition (50, 10);

   glutCreateWindow ("line and triangle");

   glutDisplayFunc(display);

   init();

   glutMainLoop();

   return 0;

}